To add fractions we have to find a common denominator and then add. To find the common denominator of the fractions we can multiply the denominators together to get 40.
Well you would have to make the bottom number equal, so the lcm (least common multiple) of 5 and 8 is 40. Which means for the first you have to multiply 5 and 8 both by five to get 25/40. Then multiply 2 and 5 both by 8 so 16/40 then add. So 25/40 + 16/40 = 41/40.
So the answer is 41/40, which reduced ia 1 and 1/40.
Here how it goes, 12 boys to 8 girls is 3:2 in ratio form but since u adding 2 more girls then 8 girls + 2 girls = 10 girls so now its 12 boys + 10 girls so your answer in final would be 6:5.
